S-91247A142 5/16"-24 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Precise thread engagement with Class 2A fit and UNF fine threading for secure fastening and vibration resistance
• Enhanced durability from Grade 5 steel construction with Rockwell C25 hardness for repeated use
• Optimized installation efficiency with external hex drive design for easy tool access and torque application
• Versatile partial threading allowing both clamping and alignment functions in assembly operations
• Industry-standard compliance ensuring interchangeability and reliability across industrial equipment

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers critical performance where structural integrity matters most. The 5/16"-24 UNF fine thread configuration provides superior resistance to vibrational loosening in machinery, automotive, and heavy equipment applications. With partial threading along its 7" length, engineers benefit from both the clamping force of threaded sections and the alignment stability of unthreaded shanks. The zinc plating surface treatment offers essential corrosion protection for industrial environments where moisture and chemicals are present. The external hex drive design ensures compatibility with standard tools while accommodating high torque requirements. These industrial hex screws solve common fastening challenges by combining high-strength materials with precision threading for reliable, long-term performance in critical assemblies.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerances with 5/16"-24 UNF fine threading and partial threading configuration. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications, it delivers consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while meeting international quality standards for heavy-duty fastening applications.